Pandemic Flu

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What is Pandemic Flu?

A flu pandemic is a global outbreak of influenza caused by a new influenza virus. Pandemics occur when new strains of the influenza virus, often from avian or porcine sources infect people. For a pandemic to be declared, the new influenza virus subtype must emerge for which there is little or no immunity. In addition, it must infect humans and cause illness and spread easily and continue without interruption among humans. These new influenza viruses strains can spread quickly because most people will not be immune to the new virus strain and a vaccine might not be widely available to offer immediate protection. Given the growth of global travel, a pandemic can spread rapidly and globally giving countries and regions little time to prepare a public health response.

Inﬂuenza pandemicsarerare with four being recorded in the past 100 years - 1918,1957, 1968 and 2009.Pastinﬂuenzapandemics havebeencausedbyInﬂuenzaAviruses, strains H1N1, H2N2 and H3N2. past pandemics

Virus often infect only one species or group of animals and do not efficiently infect other animals. Periodically,avirusmaymutatetoaformthatisreadilytransmittedfromhumantohuman.Thetwomostlikelyroutesthatcouldresultinthetransferbetweenunrelatedanimalsare:

Antigenic Drift: The virus goes through several point mutations and acquires the ability to infecthumans AND transfer efﬁciently from human to human. This is thought to be whathappened in 1918.

Antigenic Shift: A mammalian host (human or pig) becomes infected with both a common humanﬂu strain and a virulent avian ﬂu strain. The two viruses combine in the pig to forma new virus with the virulence of the bird strain and the ability to pass from humanto human. This occurred in the pandemics of 1957 and 1968. This re-assortment could also occur in humans, which is why it is very important that sick individuals avoid contact withbirds.

The WorldHealthOrganization(WHO)closelymonitorstheemergenceofnewstrains,suchasinﬂuenza A strains H1N1 and H7N9.

Phases of Pandemic Influenza

The WHO classiﬁes the global stages associated with a pandemic alert. The phases reflect the WHO’s risk assessment of the global situation regarding each influenza virus with pandemic potential infecting humans. The phases provide a high-level, global view of the evolving picture. The four phases of a pandemic are interpandemic, alert, pandemic and transition.

Interpandemic phase: This is the period between influenza pandemics.

Alert phase: This is the phase when influenza caused by a new subtype has been identified in humans. Increased vigilance and careful risk assessment, at local, national and global levels, are characteristic of this phase. If the risk assessments indicate that the new virus is not developing into a pandemic strain, a de-escalation of activities towards those in the interpandemic phase may occur.

Pandemic phase: This is the period of global spread of human influenza caused by a new subtype based on global surveillance. Movement between the interpandemic, alert and pandemic phases may occur quickly or gradually as indicated by the global risk assessment, principally based on virological, epidemiological and clinical data.

Transition phase: As the assessed global risk reduces, de-escalation of global actions may occur, and reduction in response activities or movement towards recovery actions by countries may be appropriate, according to their own risk assessments. pandemic flu risk management

In2009,anew strainofH1N1Inﬂuenza,originallyfrompigs,acquiredtheability tobe transmittedamong humans. However, contact with pigs was not associated with ongoing transmission in the 2009 influenza pandemic. More information on the H1N1 pandemic influenza can be found here. CDC pandemic flu resources

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